laravel dingo/api abnormal repeated output json

Laravel repeatedly outputs two jsons after integrating dingo/api management API

<code>{"message":"Trying to get property of non-object","status_code":500}{"message":"Trying to get property of non-object","status_code":500}</code>

Is this a configuration error or is this component incompatible?
laravel5.3
dingo/api: 1.0.x@dev

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Laravel repeatedly outputs two jsons after integrating dingo/api management API

<code>{"message":"Trying to get property of non-object","status_code":500}{"message":"Trying to get property of non-object","status_code":500}</code>

Is this a configuration error or is this component incompatible?
laravel5.3
dingo/api: 1.0.x@dev

Trying to get property of non-object
$json=$obj->name;$obj may be null or not an object, please check it